Dark all the way. With heat whenever possible.

Current favorite chocolate bar is one called Firecracker, by Chuao chocolatier. Dark chocolate with cayenne pepper and pop rocks. Amazing. Starts with a smooth, rich dark chocolate taste, then the heat begins to come through. At the very end you get the little explosions.

This is a must-try if you like chocolate and you like spicy food. The pop rocks at the end just add an element of fun.